Physiological and morphological correlates of blood parasite infection in urban and non-urban house sparrow populations

Bichet, Coraline; Brischoux, François; Ribout, Cécile; Parenteau, Charline; Meillère, Alizée; Angelier, Frédéric

doi:10.1371/journal.pone.0237170

Cited by 9 publications

(4 citation statements)

References 114 publications

(204 reference statements)

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“…As the season progresses, it is expected that the possibilities of new hemoparasite infections increase (Bichet et al . 2020; Rodrigues et al . 2020).…”

Section: Methodsmentioning

confidence: 99%

“…However, during 2014, 2016, and 2017, all captures (58 yearling adults) were only performed at 13 days posthatching. As the season progresses, it is expected that the possibilities of new hemoparasite infections increase (Bichet et al 2020;Rodrigues et al 2020). Thus, for this analysis, we only used data from yearling adults that were captured when their nestlings were less than 7 days old.…”

Section: Effects Of Vector Abundances On Blood Parasite Abundancesmentioning

confidence: 99%

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Differential effects of environmental climatic variables on parasite abundances in blue tit nests during a decade

Castaño‐Vázquez

Merino

2022

Integr. Zool.

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Models on climate change have predicted an increase of temperature over the earth's surface with potential drastic effects on living organisms. We analyzed the relationships between climatic conditions (temperature, rainfall, and wind speed) and the abundance of blood‐sucking flying insects (biting midges and blackflies) and nest‐dwelling ectoparasites (mites, fleas, and blowflies) collected from blue tit nests during bird breeding seasons for a period of 10 years. Average temperature, rainfall, and wind speed showed significant differences among years. Temperature and wind speed increased during the period of study while rainfall decreased. Biting midge, blackfly, and blowfly abundances increased across years but not flea and mite abundances. Hatching date decreased and brood size increased across years. Independently of year variation, parasites were related to climatic variables. For example, biting midge, blowfly, mite, and flea abundances were positive and significantly related to average temperature. We also found a positive and significant relationship between abundances of Haemoproteus infections and biting midge abundances during the first year of life of birds out of nests. However, abundance and prevalence of Lankesterella infections in yearlings were positive and significantly related to mite abundances during the year of birth of birds. Leucocytozoon and Lankesterella infections were also significantly related to climatic variables and Haemoproteus and Lankesterella infections increased across years. In addition, body condition of adult females and males were negatively related to flea larvae and blowfly abundance respectively. Nestling body condition was also negatively related to biting midge abundance. Changes in climatic conditions across years could therefore affect several parasites of birds but also to birds themselves.

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“…As the season progresses, it is expected that the possibilities of new hemoparasite infections increase (Bichet et al . 2020; Rodrigues et al . 2020).…”

Section: Methodsmentioning

confidence: 99%

Section: Effects Of Vector Abundances On Blood Parasite Abundancesmentioning

confidence: 99%

Differential effects of environmental climatic variables on parasite abundances in blue tit nests during a decade

Castaño‐Vázquez

Merino

2022

Integr. Zool.

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“…temperature, rainfall, cloud cover, vegetation) are more important in predicting body condition than are differences in malaria resilience. Also contrary to our predictions, body condition was greater in infected birds, a relationship also detected in some house sparrow populations (Jiménez‐Peñuela et al ., 2019; Bichet et al ., 2020). One possible explanation for this pattern is that avian malaria may selectively cause higher mortality among birds in low than high body condition, and thus only the high condition birds remain.…”

Section: Discussionmentioning

confidence: 99%

Variation in immunity and health in response to introduced avian malaria in an endemic Hawaiian songbird

Names

Schultz

Hahn

et al. 2021

Animal Conservation

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Emerging infectious diseases are spreading at unprecedented rates and affecting wildlife worldwide, with particularly strong effects on islands. Since the introduction of avian malaria to Hawaii a century ago, the disease has contributed to the decline and extinction of several endemic Hawaiian honeycreeper species. At low elevation, where avian malaria is prevalent, Hawaii Amakihi Chlorodrepanis virens honeycreeper populations have experienced strong selection by the disease and have evolved increased malaria resilience, the ability to recover from infection. The goals of this study were to describe malaria infection rates across Hawaii Island, to examine the role of innate immunity in malaria resilience, and to determine the effects of resilience and chronic infection on Amakihi health. We measured malaria infection and metrics of innate immunity and health in low elevation Amakihi populations, which are more resilient to malaria, and high elevation populations, which have experienced weak malaria selection and are less resilient to malaria. Avian malaria infection was higher at low than high elevation. Measures of innate immunity were higher in low than high elevation Amakihi, but also depended on whether the birds were from the leeward side of the island (low rainfall) or windward side of the island (high rainfall) and whether they were freeliving or captive. Regarding measures of health, body condition was better in malaria-infected than uninfected Amakihi, while hematocrit did not vary by malaria infection but was higher in high than low elevation birds. These are among the first results to describe variation in immunity and health according to avian malaria selection and infection in Hawaiian honeycreepers. Understanding the impacts of introduced diseases on island species, which are particularly susceptible to novel pathogens, will provide critical insight into how introduced disease may affect endangered species.

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“…We assume an initial target population Tfalse(0false)=4×106 cells mnormall−1 [10] and no exposed or infected cells Efalse(0false)=Ifalse(0false)=0 cells mnormall−1. The empirical infectious inoculum was 1500 PFU which, when distributed across 2.5 ml of blood [14], gives an initial inoculum concentration of 600 PFU ml −1 . We assumed an initial Vfalse(0false)=10 PFU mnormall−1 infectious titre, and rejected Vfalse(0false)=100 PFU mnormall−1 and Vfalse(0false)=600 PFU mnormall−1 initial conditions through model selection (see table S1 in the electronic supplementary material).…”

Section: Methodsmentioning

confidence: 99%

The effect of model structure and data availability on Usutu virus dynamics at three biological scales

Heitzman-Breen,

Liyanage,

Duggal

et al. 2024

R. Soc. Open Sci.

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Understanding the epidemiology of emerging pathogens, such as Usutu virus (USUV) infections, requires systems investigation at each scale involved in the host–virus transmission cycle, from individual bird infections, to bird-to-vector transmissions, and to USUV incidence in bird and vector populations. For new pathogens field data are sparse, and predictions can be aided by the use of laboratory-type inoculation and transmission experiments combined with dynamical mathematical modelling. In this study, we investigated the dynamics of two strains of USUV by constructing mathematical models for the within-host scale, bird-to-vector transmission scale and vector-borne epidemiological scale. We used individual within-host infectious virus data and per cent mosquito infection data to predict USUV incidence in birds and mosquitoes. We addressed the dependence of predictions on model structure, data uncertainty and experimental design. We found that uncertainty in predictions at one scale change predicted results at another scale. We proposed in silico experiments that showed that sampling every 12 hours ensures practical identifiability of the within-host scale model. At the same time, we showed that practical identifiability of the transmission scale functions can only be improved under unrealistically high sampling regimes. Instead, we proposed optimal experimental designs and suggested the types of experiments that can ensure identifiability at the transmission scale and, hence, induce robustness in predictions at the epidemiological scale.

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Physiological and morphological correlates of blood parasite infection in urban and non-urban house sparrow populations

Cited by 9 publications

References 114 publications

Differential effects of environmental climatic variables on parasite abundances in blue tit nests during a decade

Differential effects of environmental climatic variables on parasite abundances in blue tit nests during a decade

Variation in immunity and health in response to introduced avian malaria in an endemic Hawaiian songbird

The effect of model structure and data availability on Usutu virus dynamics at three biological scales

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